Locking device.



J. E. LAGERGREN.

LOCKING DEVICE. APPLICATION FILED MAR 20, 1906.

Patented July 25 NITE STATES. a'rnn'r OFFICE.

JOHN E. LAGERGREN, OF BROOKLYN, NEW FORK, ASSIGNOR T CHRISTIAN W. SCHILDWACHTER AND GEORGE J. REESSING, OF NEW YORK, N. Y;

LOCKING DEVICE.

- Application filed'March 20, 1906. Serial No. 307,034.

To all whom it ma yconcern:

Be it known that I, JoHN E. LAGERGREN,

a citizen of the United States, and a resident of Brooklyn borough, in the county of Kings and State of New York, have invented. a cer- 1 tain new and useful Improvement in. Looking Devices, of which the following is a specification.

.This invention relates to a locking device suitable for use in many places, such as 'elevators, steering heads of vehicles, the rudders of boats and other vessels, hand-operated brakes, etc.,'the primary object being to prevent a rotatable part from moving: in either direction while permitting said part to be moved'at will by power applied from one side thereof but; not from the other; and other objects,as will appear hereinafter.

The invention consists in the combinations of devices hereinafter described and more particularly pointed out in the appended claims.

,The invention isembodied in the device illustrated in the accompanying drawing, forming part hereof, in Which- I Figure 1 is an elevation, partly in section; Fig. 2 is :an elevation; Fig. 3 is a plan view in section; Fig. 4 is a perspective view of operating jaws; andFig. 5 illustrates a modification.

The reference numeral 1 marks a fixed member which is provided with aninside frictionor locking-surface 2, the said member being shown as furnishing a hearing 3 for a shaft 4. The member 1 may be a ,flange fixed to any convenient fixed part (not shown). lVithin the member 1 is a ring-segment 5 whose ends are shown, in Fig. 3, as by being enlarged inwardly of the ring and such projections 10 are provided with opposite faces 6 parallel with the axis of the shaft 4, but at an acute angle with each other, the opening between said faces being toward said shaft 4.

The reference 7 marks a rotatable member which it is desired to lock against motion in either direction. the drawing, the member 7 has a face 8 opposite the opening of the angle between the faces 6. and, in the form shown in Figs. 1 to 4, a triangular ring-expander 9 is inserted in the triangular space formed by said faces 6 and 8, there being a little play between the said expander and the face 8, as is indicated in Fig. 3 by the dark line between the ex- In the instance shown in pander and the member 7. .If now an attempt is made (except as hereinafter described) toturn the-member 7 in either direction, the face 8 forces theexpander 9 outward, thus spreading the ends of the ring-segment and forcing that segment firmly against the inside surface "of the flange or member 1, and locking the whole together so that the member 7 cannotturn. If, however, force be applied at either end of the segment, in a tangential direction and toward the opening between the ends of the pander 9, and the member 7 are all moved together, and,'on being'released from such force, the parts" are ready in the new position to lock the member 7 1 as above described. The heads orprojections 1O aforesaid are shown, in Fig. 3, as having faces 11 at angles withthe faces 6 aforesaid, and the described circular motion of the ring-segment, expander, and member 7 may be im-- parted by pushing against-either face 11, as.

whereby it may be turned in either direction. A retainer cap 17 fits down over the flange 1 and the sleeve 14 to prevent accidental displacement of the expander 9 and to exclude dirt, etc. i

In the modification shown in Fig. 5, the

ring-segment surrounds the friction-surface 2*, and its ends are formed into or are provided with pins or projections 10*. vhich stand to one side of the ring and above the level of the member 1, while the sliding block 9* is provided with a pair of inclined jaws, or faces 6* which. as the member forces the block 9* outward, draw the segment ends toward each other and so cause the segment to grip the surface 2*. The operating wrench, in this case, acts on the block 9* in rotating the member 7, the segment, and the block 9*.

The member 7 being fast on the shaft 4, the said shaft may operate the steering-gear segment, the said ring-segment, the exof a vehicle or a vessel or boat, and such gear will remain where put by the one operating the hand-wheel 16, while being movable to another position at will. If the shaft ,4: actuates a brake-mechanism, such mechanism will remain on or off, as the case may be, until the locking device is operated or released intentionally. If the shaft 4 operates the cable-winding devices of an elevator and the power is applied through the shaft 15, the failure of the power (as an electric current) will not cause the elevator to-fall. Other applications of the invention are included within its scope.

It is noted that there must be some play between themember 7 and the wrench or jaws 12 in order to allow the member 7 to move the block or expander 9 far enough to look before the sides of the member. 7 strike the jaws to move them. Such play is indicated in Fig. 3 by the heavy lines between said parts.

WVhat I claim as new and desire to secure by Letters Patent of the United States is 1. The combination with a fixed circular flange, of a ring-segment adapted to coact therewith frictionally and having projections at its ends, a rotatable member having the same axis of motion as said ring, and a ringoperator coacting with said end-projections and actuated by saidrotatable member, one

of said ring-operator and end-projection elements having faces oblique to each other and the angle thereof opening toward said axis of motion, whereby said rotatable member is locked against rotation by force acting through it.

2. The combination with a fixed circular flange, of a ring-segment within the same and adapted to coact therewith frictionally, projecting ends on said ring provided with oblique faces opening toward the center of the ring, a rotatable member within the ring which it is desired to lock and provided with a straight face, and a triangular block interposed between said face andsaid oblique faces, whereby said rotatable member is locked against rotation by force acting through it.

3. The combination with a member provided with a friction-surface, a segment-ring adapted to be brought into frictional contactwith said surface and provided with pr0- jections at the ends thereof, a rotatable member which it is desired to lock, a block operated'by said rotatable member and provided with faces oblique to each other and coacting with said projections to force said segment-ring into frictional contact with said friction-surface, whereby said rotatable member is looked against rotation by force acting through it.

Signed at New York in the county of New York and State of New York this ninth day of March, A. D. 1906.

JOHN E. LAGERGREN! Witnesses:

ENOGH REoToR, R. W. BARKLEY.

Copies of this patent may beobtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

